Table of Contents
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Refrigeration System Diagnosis
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Restricted line on the high side
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Restricted drier
• Defrost damper stays open
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Defrost damper stuck closed
Suction service valve back seated
• Faulty Condenser Inlet Solenoid (CIS)
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• Faulty Hot Gas Solenoid (HGS)
• Loose or broken electrical connections
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Sensor out of calibration
Suction pressure gauge out of calibration
Leaky receiver tank outlet valve
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• Faulty Suction Pressure Regulator (SPR)
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• Faulty Purge Valve (PV) (T-500R/T-Dairy)
• Faulty Condenser Check Valve
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• Faulty Receiver Tank Pressure Check Valve
Possible Causes
15-3
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